Tool for removing electrode tips



Aug. 31, 1943.

R. H. DYER 2,328,433

TOOL FOR REMOVING ELECTRODE TIPS j 22 23 lllllillllllllll r'flllll wnnawiff I) w z/ 42 INVENTOR BY Rex/10y.

ATTQR'NEY hi-iii. Z.

Aug. 31, 1943. R. H. DYER FOR REMOVING ELECTRODE TIPS TOOL Filed March 15, 1941 2 Sheets-Sheet 2 29 I 2 L M) INVENTOR Y Rex/Myer.

ATTOFQNEY Patented Aug. 31, 1943 UNITED STATES 'TPATEN ism-cs T0 0L FOR. REMOVING ELEGTRQDEITIPS RexH. Dyer, Kansas City,Mo., assignor.of' one-half to Harry Allshouse' ApplioationMarch 15, 194=1,1Serial,No.. ii83l58.1

6 Claims.

This'dnvention relates to a tool for-removing electrode tips of welding .machines wherein the tips have tapered-shanks that are wedged in tapered sockets of the holders therefor. Since the tips'and holders are hollowand have interconnected passages ior'the circulation ofa cooling medium, scale and corrosion collect around the-tapered shanks-0f the tips and make it dimcult *towithdraw the tips when it is necessary to replace them.

-'Iherefore,-the-principal object of the invention isto provide'a-tool whereby the tipsmay be readily withdrawn from theirtapered sockets without injuring or in anywaydamaging the holders.

In accomplishing this and-other objects-of the invention, as hereinafter pointed out, I have provlded improved details of structurathe preferred form of which is illustrated in the accompanying drawings, wherein:

Fig. l-isa perspective viewof the head of a welding machine and showinga tool which embodiesthe features of the presentinvention applied to one' of theelectrode tips for eifecting removal thereof.

Fig. 2'isa fragmentary section through the tip. the tip holder and head'of 'thetool.

3 is a plan view of the gripping element of the tool with the fiack element shown-in dot and dash lines.

Fig.4 is-a view similarto Fig. 3 but showing the gripping element-in clamped position.

Fig. 5 -is a longitudinal section through the tool-elements on the line 5--5 of Fig. 3.

Fig. 6is'a perspective viewof theparts of the tool shown in disassembled spaced relation.

-Referring more in-detail to the drawings:

I designates a tool constructed in accordance with the present'invention and particularly designed for effecting removal of an electrode tip from its holder. The tool includes a gripping element 2 for-gripping theelectrode tip and a jack element 3 cooperating with the gripping element for efiecting withdrawal of the tapered shankofthe electrode tip from its holder, as later-described. I'hegripping element 2 comprises cooperating jaw members 4 and 5 having substantially arcuate gripping faces-6 and 1 pro vided with a plurality of teeth 8 adapted to'bite into the metal of the electrode tip. Fixed on one of the jaws and extending laterally therefrom in concentric relation with the arcuate-face thereof is a ring-like collar 9 having an axial opening Into passanelectrode tip and provided onthe exterior-su'rface-with threads ll.

:The .jaw 14 carrying the-threaded collar has a handle :lever. 12 extendin :laterally therefrom and ,.which 10f -:substantia1 y.. ,channe efihapfi :cross-sectionlto iprovidespaced: flanges. 1:3 and M .ongthexespentive ridesqof .arrounded,rfineeresrippin portion 11.5. lI-Yhenflanses 1|;3 and 1114 cooper-- .atewiththeerinping pnrtion Lfiyto iormcan elongated recess Eli openin thmughthexface ;of the lever inthedirection 11f tthepther :iaw member whet-flanges 1l:3..;.and :Mmroiect item :th .:.h0 iv ;of :theshandlezrtot nrrnaea-rs t1 vrand: Ul shavin axially aligned openings .|9.:therethrough,;as-best shown. in Eiarb. ."Iihe end-3010f theihandlelev r opposite :theiiarvjspf; .solid :construction ,andxhas .an zinternally :;thread d bor (2| extending-su .stantially coaxial!!! with:.the.-;hand e'c,f.0 r cei ;insthe threadedishankafiiqfra setgscrewazl .T set-screwhasahea 84=in-theexterionend thereof whereby the shank is adiu-stably threaded in the :bore 2|. {Lhe {inner end of the set-screw terminates rinthe recess lfi and is provided with ,a reduced .pintle .25.

The-other iaw.5 hasan-arm portion 26 terminatingin a laterally extending ear .2! received between the earsl1 .and,l8 of the handle lever of the other jaw and. which, is provided ,withan openingZB registcrinswith the openings ,l9 to passa pivot member,.suchasarivetlfl, on which the jaw5 is pivoted to and from thejawfi.

Pivotallymounted on the arm 26, at the side pp itel heea illiflisa handlermem er 311 having aportionSl shaped tofit the palm .of the hand and having "forwardly extending earsj32 and "33 spaced apart to accommodate the arm '26. The ears '32and33'have openings .34 registering with an opening 35in the arm ZB for passing'a fastening devicesuch as a rivet 35, whereby the handle member 30 is pivotally connected-with-the-iaw--5. I-he-handle member 30 is also of channel-shapedcross-sectionand has an'open side'-3l facing theopen side'of thechannel-like 'rec'ess'of the otherhandle-lever.

Formed in 'the handle lever,--in spaced relation with the "pivotal connection of 'the handle member, are 'open'ings 38- -for-passing a rivet-39, or the"1il e,t0 pivotally mount atoggle arm!!! therebetween. 'Ihe toggle' arm has a free end fliprojectingdnto the recess F9 to-engage-against the pintle 25 of the set-screw. *The toggle'arm also has a lateral stop 42 projecting from the side thereofadjaeent the handleanember -30, as shown in Figs. 3 and i. r

The jack'element"-3-inclucles-a "ring or collar '43 having internalthreads 'fladapted to engage the external threads H on the ring-like collar 9, as shownin'Fig; 2. Extending from thecollar H3 is a handle 45 whereby the collar 43 is turned upon the collar 9.

The tool just described is particularly designed for removing the electrode tip a having a tapered shank b from the tapered socket c of a holder (1 of a welding machine 6. The holder (1 has a water channel ,1 opening into a water chamber g in the electrode tip.

The electrode structure thus described is conventional and specifically forms no part of the present invention, however, it is illustrated to give a better understanding of the operation of my improved tool, as now to be described.

In removing the electrode tip a, the jack element 3 is threaded upon the collar 9 on the jaw t of the gripping element 2 and the assembly is slipped over the body of the electrode tip a so that the face of the jacket collar is in position to engage the lower end of the tip holder. The setscrew 23 is then adjusted so that when the handle levers l2 and are drawn toward each other to bring the jaws 3 and 4 into gripping engagement with the body of the electrode tip, the pivot 39 for the toggle member will spring past dead center position between the handle lever --and the terminal end of the set-screw so that the jaws are retained in gripping engagement with the body of the electrode tip. The teeth 8 on the jaws bit sufficiently into the metal of the tip so that the jaws'are retained thereby from longitudinal movement.

The handle of the jack element 3 is then gripped with one hand and the levers i2 and ll: of the gripping device 4 with the other hand. While the gripping device is being held from movement, the handle 45 of the jack element is moved with respect thereto so that the collar of the jack element is threaded against the end of the tip holder, thereby assuring a wedging pressure between the holder and the gripping element of the tool. Since the tool grips the electrode tip, the pressure acts to effect withdrawal of the tapered shank b from the tapered socket c of the holder so that the tip is readily withdrawn therefrom without damage to the holder. Upon removal of the upper tip, the lower tip of the welding machine may be removed in like manner.

From the foregoing it is obvious that I have provided a tool which is of relatively simple construction and which is designed to facilitate removal of the electrode tips of a welding machine without in any way damaging the holders retaining the tips.

1 What I claim and desire to secure by-Letters Patent is: f

1. A tool for removing the tip from the holder of a welding machine including, jaws having gripping faces arranged to circumferentially engage the tip, a lever arm extending from one of the jaws and laterally with respect to the axis of the tip when gripped by said jaws, an arm extending from the other jaw alongside the lever arm, connecting means hinging said arms on an axis parallel with respect to the axis of said tip, jack means fixed to one of the jaws substantially coaxial with the gripping face of said jaw and in a position to engage the holder when the tool is moved axially over the end of said tip, and means for actuating thejack means for exerting an axial pressure bettwen the jaws and the holder to effect withdrawal of the tip from the holder.

2. A tool for removing the ti from the holder gripping of a welding machine including, laws having gripping faces arranged to circumferentially engage the tip, a lever arm extending from one of the jaws and laterally with respect to the axis of the tip when gripped by said jaws, an arm extending from the other jaw in substantially the plane of the lever arm, connecting means hinging said arms on an axis parallel with respect to the axis of said tip, a collar on one of the jaws to circle the tip when the tool is moved axially over the end of said tip, locking means interconnecting said arms for retaining the jaws in gripping relation with the tip, a ring having threaded engagement with the collar, and means for turning the ring for exerting an axial pressure between'the jaws and the holder to effect with-- drawal of the tip from the holder.

3. A tool for removing the tip from the holder of a welding machine including, jaws having gripping faces arranged to circumferentially engage the tip, alever arm extending from one of the jaws and laterally with respect to the axis of the tip when gripped bysaid jaws, an arm extending from the other jaw alongside the lever arm, connecting means hinging said arms on an axis parallel with respect to the axis of said tip, a ring-like collar on one of the jaws and in a position to encircle the t ip when the tool is moved axially over the end of said-tip, a ring having threaded engagement with the c-ollar to engage the holder, and an arm extending radially of the ring to turn the ring on the collar and exert an axial pressure between the jaws and the holder to eli'ect -vithdrawai of the tip gripped by said jaws. Q

i. A tool for removing the tip from the holder of a welding machine including, jaws having races arranged to circumferentially engage the tip, a lever arm extendingfrorn one of the jaws and laterally with respect to the axis of the tip when gripped by said jaws, an arm extending from the other jaw alongside the lever arm, connecting means hinging said arms on an axis parallel with respect to the axis of said tip, a ring-like collar on one of the jaws and in a positionto encircle the when the tool is moved axially over the end of said tip, locking means interconneotingsaid arms for retaining the jaws in gripping relation with the tip, a ring having threaded engagement with the collar and adapted to engage the holder, and an arm extending radially of the ring to turn the ring on the collar and exert an axial pressure between the jaws and the holder to effect withdrawal of the tip gripped by said jaws.

5. A tool for removing the tip from the holder of a welding machine including, jaws having gripping faces arranged to" engage the tip circumferentially thereof, a lever arm. extending from one of the jaws and laterally witl'rrespect to the axis of the tip when gripped by said jaws, an arm extending from the other jaw substantially in the plane oi-the lever arm, connecting means hinging said arms on an axis parallel with respect to the axis of said tip, a handle lever ivoted to the last named arm and cooperating with the lever arm in positioning the jaws in contact with the p a toggle lever having pivotal connection with the handle lever and stop engagement with the l ver arm, said handle lever being movable toward the lever arm to bring said jaws in gripping position and locate said pivotal connection for the toggle lever in a dead center position betweenfsaid pivotal connection of the handle lever and said point of stop engagement, jack means carried by one of the jaws, and means for actuating the jack means to exert a. thrust between the electrode holder and said jaws to effect withdrawal of the tip from the holder,

6. A tool for removing the tip from the holder of a. welding machine including, jaws having gripping faces arranged to engage the circumference of the tip, a lever arm extending from one of the jaws laterally with respect to the axis of the tip when gripped by said jaws, an arm extending from the other jaw substantially in the plane of the lever arm, connecting means hinging said arms on an axis parallel with respect to the axis of said tip, a. handle lever pivoted to the last named arm, a toggle lever having pivotal connection with the handle lever and stop engagement with the first named lever arm to eifect locking of the jaws on the electrode tip, a ring-like collar on one of the jaws and in position to encircle the tip when the tool is moved axially over the end of saidvtip to bring the collar in engagement with the holder, a ring having. threaded engagement with the collar, and. an arm extending from the ring to turn the ring on the collar and exert an axial pressure between the jaws and the holder to effect withdrawal of the tip from said holder.

REX H. DYER. 

